Hippo, Crocodile, Pelican, Flamingo, Fish Eagle, and Goliath Heron, to name a few, can be found in Lake St. Lucia eco-system.

The Estuary Boat Cruises are done in boats powered by eco-friendly quiet and smoke-free motors, which bring you up close to Hippos, Crocodiles and the Birdlife in the estuary.

Tours take two hours and depart 3 to 4 times a day.

The Nile crocodile is the largest crocodilian in Africa and is sometimes regarded as the second largest crocodilian after the Saltwater crocodile, usually measuring between 3.3 and 5 m (11 and 16 feet), but can grow to 6 m (20 ft). Good sized males weigh 500 kg (1100 lb), but can also reach up to 2000 lbs (909 kg). The largest accurately measured male was shot near Mwanza, Tanzania and measured 6.45 m (21.3 ft) and weighed aproximately 1,090 kg (2,400 lb). Like all crocodiles they are sexually dimorphic, with the males up to 30% larger than the females, though the difference is even less in some species, like the Saltwater crocodile.

Adult Nile crocodiles use their bodies and tail to herd groups of fish toward a bank, and eat them with quick sideways jerks of their heads. They also cooperate, blocking migrating fish by forming a semicircle across the river. 
The most dominant crocodile eats first

Hatchlings eat insects and small aquatic invertebrates, and quickly graduate to amphibians, reptiles, and birds. But even as an adult, a significant portion of a Nile crocodile's diet is fish and other small vertebrates. However adult crocodiles prefer to consume larger prey to conserve energy. In the absence of large prey, they gradually have to move onto smaller prey. Nile crocodiles have a very broad diet and can potentially eat nearly any animal that comes to take a drink at the edge of the water. The most frequently recorded mammalian prey taken by Nile crocodiles are waterbuck, sitatunga, lechwe, wildebeest, zebra, warthog, goats, sheep and cattle. Other crocodiles, including their own species have been recorded to be eaten. Cape buffalo and giraffes have also been taken. Lion have occasionally been taken, and there is at least one record of a group of crocodiles killing a female rhinocerous in the Tana river.

The hippopotamus is recognizable for its barrel-shaped torso, enormous mouth and teeth, hairless body, stubby legs and tremendous size. It is similar in size to the White Rhinoceros; only elephants are consistently heavier. Despite its stocky shape and short legs, it can easily outrun a human. Hippos have been clocked at 30 mph (48 km/h) while running short distances, faster than an Olympic sprinter. The hippopotamus is one of the most aggressive animals in the world. There are an estimated 125,000 to 150,000 hippos remaining throughout Sub-Saharan Africa

Hippopotamuses are one of the largest extant mammals in the world. They can live in the water, or go on land. Their specific gravity allows them to sink and walk or run along the bottom of a river. Hippos are considered megafauna, but unlike all other African megafauna, hippos have adapted for a semi-aquatic life in freshwater lakes and rivers.

Because of their enormous size, hippopotamuses are difficult to weigh in the wild. Most estimates of the weight come from culling operations that were carried out in the 1960s. The average weights for adult males ranged between 1500–1800 kg (3,300–4,000 lbs). Females are smaller than their male counterparts, with average weights measuring between 1300–1,500 kg (2,900–3,300 lbs). Older males can get much larger, reaching at least 3,200 kg (7,100 lbs) and occasionally weighing 3636 kg (8000 lbs). Male hippos appear to continue growing throughout their lives; females reach a maximum weight at around age 25